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// Gawain vertex array IDs
//
// This code is part of the Gawain library, with modifications
// specific to integration with Blender.
//
// Copyright 2016 Mike Erwin, Clément Foucault
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.#include "buffer_id.h"
#include "gwn_vertex_array_id.h"
#include "gwn_context.h"
#include <vector>
#include <string.h>
#include <pthread.h>
#include <mutex>
#if TRUST_NO_ONE
extern "C" {
extern int BLI_thread_is_main(void); // Blender-specific function
}
static bool thread_is_main()
{
// "main" here means the GL context's thread
return BLI_thread_is_main();
}
#endif
struct Gwn_Context {
GLuint default_vao;
std::vector<GLuint> orphaned_vertarray_ids;
std::mutex orphans_mutex; // todo: try spinlock instead
#if TRUST_NO_ONE
pthread_t thread; // Thread on which this context is active.
#endif
};
static thread_local Gwn_Context* active_ctx = NULL;
static void clear_orphans(Gwn_Context* ctx)
{
ctx->orphans_mutex.lock();
if (!ctx->orphaned_vertarray_ids.empty())
{
unsigned orphan_ct = (unsigned)ctx->orphaned_vertarray_ids.size();
glDeleteVertexArrays(orphan_ct, ctx->orphaned_vertarray_ids.data());
ctx->orphaned_vertarray_ids.clear();
}
ctx->orphans_mutex.unlock();
}
Gwn_Context* GWN_context_create(void)
{
#if TRUST_NO_ONE
assert(thread_is_main());
#endif
Gwn_Context* ctx = (Gwn_Context*)calloc(1, sizeof(Gwn_Context));
glGenVertexArrays(1, &ctx->default_vao);
GWN_context_active_set(ctx);
return ctx;
}
// to be called after GWN_context_active_set(ctx_to_destroy)
void GWN_context_discard(Gwn_Context* ctx)
{
#if TRUST_NO_ONE
// Make sure no other thread has locked it.
assert(ctx == active_ctx);
assert(ctx->thread == pthread_self());
assert(ctx->orphaned_vertarray_ids.empty());
#endif
glDeleteVertexArrays(1, &ctx->default_vao);
free(ctx);
active_ctx = NULL;
}
// ctx can be NULL
void GWN_context_active_set(Gwn_Context* ctx)
{
#if TRUST_NO_ONE
if (active_ctx)
active_ctx->thread = 0;
// Make sure no other context is already bound to this thread.
if (ctx)
{
// Make sure no other thread has locked it.
assert(ctx->thread == 0);
ctx->thread = pthread_self();
}
#endif
if (ctx)
clear_orphans(ctx);
active_ctx = ctx;
}
Gwn_Context* GWN_context_active_get(void)
{
return active_ctx;
}
GLuint GWN_vao_default(void)
{
#if TRUST_NO_ONE
assert(active_ctx); // need at least an active context
assert(active_ctx->thread == pthread_self()); // context has been activated by another thread!
#endif
return active_ctx->default_vao;
}
GLuint GWN_vao_alloc(void)
{
#if TRUST_NO_ONE
assert(active_ctx); // need at least an active context
assert(active_ctx->thread == pthread_self()); // context has been activated by another thread!
#endif
clear_orphans(active_ctx);
GLuint new_vao_id = 0;
glGenVertexArrays(1, &new_vao_id);
return new_vao_id;
}
// this can be called from multiple thread
void GWN_vao_free(GLuint vao_id, Gwn_Context* ctx)
{
if (ctx == active_ctx)
glDeleteVertexArrays(1, &vao_id);
else
{
ctx->orphans_mutex.lock();
ctx->orphaned_vertarray_ids.emplace_back(vao_id);
ctx->orphans_mutex.unlock();
}
}
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